Yum Brands (YUM+1%) falls 1.5% in premarket trading after McDonald's issues its relatively weak Q3 report and early warning on Q4. On the topic of rivals in the space, the company was referred to indirectly yesterday during Chipotle's CC (transcript) when execs maintained their company wasn't losing significant transactions to someone else because its model isn't easy to copy. Look for Q4 to help resolve the Chipotle vs. Taco Bell debate with Cantina Bell putting in a full quarter worth of results.